Used by the routine at E168.

this routine will load data bytes from any input device directly into the memory of the computer. It can also be used for a verify operation comparing data from a device with the data already in memory, leaving the data stored in RAM unchanged. The accumulator must be set to 0 for a load operation or 1 for a verify. If the input device was OPENed with a secondary address of 0 the header information from device will be ignored. In this case XY must contain the starting address for the load. If the device was addressed with a secondary address of 1 or 2 the data will load into memory starting at the location specified by the header. This routine returns the address of the highest RAM location which was loaded. Before this routine can be called, the SETLFS, FFBA, and SETNAM, FFBD, routines must be called.